EM Detection of Concealed Targets by David J. Daniels

By David J. Daniels

The most modern EM ideas for detecting hid pursuits, even if explosives, guns, or people

Extensively illustrated from simple rules to process layout, the elemental strategies of RF, microwave, millimeter wave, and terahertz detection structures and methods to discover hid pursuits are defined during this ebook. those hid objectives can be explosive units or guns, which might be buried within the flooring, hid in development constructions, hidden lower than garments, or within baggage. hid objectives can also be people who find themselves stowaways or sufferers of an avalanche or earthquake.

Although a lot details comes in convention court cases society guides, this ebook brings the entire suitable details in one, expertly written and arranged volume.

Readers achieve an knowing of the physics underlying electromagnetic (EM) detection tools, in addition to the standards that impact the functionality of EM detection gear, supporting them pick out definitely the right form of apparatus and strategies to satisfy the calls for of specific initiatives. one of the subject matters coated are:

  • Ultra-wideband radar and ground-penetrating radar

  • Millimeter, sub-millimeter, and terahertz systems

  • Radar platforms together with Doppler, harmonic, impulse, FMCW, and holographic

  • Radiometric systems

  • Nuclear quadrupole resonance systems

Author David Daniels has a long time of expertise designing and deploying EM platforms to realize hid pursuits. for this reason, this booklet is vital for scientists and engineers who're constructing or utilizing EM apparatus and methods for a various diversity of reasons, together with place of birth safeguard, crime prevention, or the detection of persons.

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Extra resources for EM Detection of Concealed Targets

Example text

The author is grateful for the kind permission of the IET to use copyright material from Daniels [2] relating to the propagation in dielectrics for this chapter. The chapter introduces the topic with a basic description of propagation in free space using a small electric dipole and considers near and far fields. Polarization and basic scattering from canonical targets is described and is followed by a section on radar cross section. The reflection and refraction of electromagnetic waves is considered, as is a generic description of clutter.

This reflection coefficient for the field normal to the plane causes a 1801 phase change. For an unpolarized wave some of the field components will be reflected at the Brewster angle, that is, only those normal to the plane of incidence. 9 33 Dispersion The frequency-dependent nature of the dielectric properties of the material causes the phase velocity of the component frequencies of a wideband signal to suffer differential propagation values. Hence, there will be variation in the velocity of propagation with frequency.

Local variations in the characteristic impedance of the ground can also cause clutter, as can inclusions of groups of small reflection sources within the material. In addition, reflections from targets in the side lobes of the antenna, often above the ground surface, can be particularly troublesome. This problem can be overcome by careful antenna design and incorporating radar absorbing material to attenuate the side and back lobe radiation from the antenna. In general, self-generated clutter is more significant at short time range and reduces at longer times.

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